Reinforced Polycarbonate Sheet Surface Smoothness via Fiber Morphology
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Solution Overview
Problem
Conventional methods for producing aromatic polycarbonate resin sheets and films with glass reinforcing materials result in surface roughness and poor adhesiveness, affecting designability and appearance, especially during thermal shaping and painting.
Innovation Solution
Adjusting extrusion conditions and using a specific composition of aromatic polycarbonate resin, thermoplastic resin, and E-glass reinforcing material with a flat or elliptic cross-sectional shape, and optimizing processing parameters like barrel and roll temperatures in air-pressure or thermal press molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass fiber is blended into aromatic polycarbonate resin to improve mechanical properties, then bending strength and rigidity are improved, but surface roughness increases and transparency decreases
Solution Approach 1:
The patent changes the physical parameters of the glass fiber by specifying a particular length range (3-5mm) and cross-sectional shape (flat or elliptic) to optimize both mechanical reinforcement and surface finish. This parameter optimization allows the glass fiber to provide strength while minimizing surface roughness during extrusion and molding processes.
Solution Approach 2:
The patent creates a composite material system combining aromatic polycarbonate resin with specifically shaped glass fibers. The composite achieves enhanced bending strength while the controlled morphology of the glass fiber dispersion maintains surface smoothness, resolving the contradiction between reinforcement and surface quality.
2Strength
If glass cloth is impregnated in organic solvent to produce reinforced resin sheet, then mechanical properties are improved, but productivity decreases due to solvent collection requirements
Solution Approach 1:
The patent extracts and eliminates the organic solvent impregnation step from the manufacturing process. Instead, it uses direct blending of glass fibers with aromatic polycarbonate resin in the melt state, thereby removing the productivity-limiting solvent collection requirement while still achieving reinforced mechanical properties.
Solution Approach 2:
The patent replaces the chemical impregnation method (using organic solvents) with a mechanical mixing method in the melt state. This substitution eliminates the need for solvent handling and collection apparatus, improving productivity while maintaining the reinforcement effect through proper glass fiber selection.
3Ease of manufacture
If non-reinforced layer is laminated to glass-reinforced sheet to improve punching workability, then workability is improved, but elastic modulus decreases
Solution Approach 1:
The patent changes the physical parameters of the glass fiber (length and cross-sectional shape) to achieve optimal reinforcement efficiency. The specific parameters (3-5mm length, flat or elliptic cross-section) enable the glass fiber to provide sufficient elastic modulus while the resin matrix maintains adequate punching workability, eliminating the need for laminating non-reinforced layers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves sheets and films with improved bending characteristics, surface smoothness, and adhesiveness, enabling the production of high-quality, thermally shaped products suitable for electronic and electric apparatus housings.
Implementation Method 1
a fourth step of compressing the molten resin composition molded into a sheet with a cooling roll
Implementation Method 2
a third step of molding the molten resin composition into a sheet
Data Source
Figure 1
AI summary
Provided is an aromatic polycarbonate resin sheet/film which has excellent bending characteristics and surface smoothness. It is found that a sheet having excellent surface smoothness, which cannot be achieved by conventional sheets, can be obtained by adjusting sheet extrusion conditions for a polycarbonate resin sheet/film into which a reinforcing filler is blended. It is also found that a thermally shaped article having excellent appearance can be obtained by using this sheet in pressure molding or in thermal press molding.